Catalytic combustion of methane over rare earth stannate pyrochlore

被引：63
作者：
Park, S
Hwang, HJ
Moon, J [1 ]
机构：
[1] Yonsei Univ, Dept Ceram Engn, Seoul 120749, South Korea
[2] Korea Inst Sci & Technol, Adv Mat Div, Seoul 136791, South Korea
来源：
CATALYSIS LETTERS | 2003年 / 87卷 / 3-4期
关键词：
catalytic combustion; methane; pyrochlore;
D O I：
10.1023/A:1023626226464
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Well-defined Ln(2)Sn(2)O(7) powders (Ln = La, Sm and Gd) with a phase-pure pyrochlore structure were synthesized by hydrothermal reaction. The catalytic activities of Ln(2)Sn(2)O(7) powders for methane combustion were measured. Methane oxidation started at 500 degreesC and increased with oxidation temperature. Catalytic methane combustion is strongly influenced by the presence of oxygen vacancies that form by breaking Sn-O lattice bonds as the temperature increases. Addition of manganese to the rare earth pyrochlores improved methane oxidation activity. Manganese-doped samarium stannate pyrochlore (Sm2Sn1.8Mn0.2O7) shows highest the catalytic activity. Light-off and complete oxidation temperatures were measured at about 400 and 650 degreesC, respectively.
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页码：219 / 223
页数：5
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